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CVE-2026-4258

7.5 · HIGH

Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey().

Published Mar 17, 2026CWE-347EPSS 0.36%

Overview

CVE-2026-4258 is a high-severity vulnerability. It was published on March 17, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47GitHubgithub.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461GitHubgithub.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796Refsecurity.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15751243Refsecurity.snyk.io/vuln/SNYK-JS-SJCL-15369617GitHubgist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47Refsecurity.snyk.io/vuln/SNYK-JS-SJCL-15369617

How CyberStrike helps

Frequently asked questions

What is CVE-2026-4258?

CVE-2026-4258 is a high-severity vulnerability. It was published on March 17, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-4258?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-4258?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-4258?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-4258 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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